package com.atguigu.gulimail.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.mq.OrderTo;
import com.atguigu.common.mq.StockDetailTo;
import com.atguigu.common.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimail.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimail.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimail.ware.feign.OrderFeignService;
import com.atguigu.gulimail.ware.feign.ProductFeignService;
import com.atguigu.gulimail.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimail.ware.service.WareOrderTaskService;
import com.atguigu.gulimail.ware.vo.*;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.checkerframework.checker.units.qual.A;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimail.ware.dao.WareSkuDao;
import com.atguigu.gulimail.ware.entity.WareSkuEntity;
import com.atguigu.gulimail.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {
    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    ProductFeignService productFeignService;
    @Autowired
    RabbitTemplate rabbitTemplate;
    @Autowired
    WareOrderTaskService wareOrderTaskService;
    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;
    @Autowired
    OrderFeignService orderFeignService;

    private void unlock(Long skuId,Long wareId,Integer num, Long taskDetailId){
        //库存解锁
        wareSkuDao.unlockStock(skuId,wareId,num,taskDetailId);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity();
        detailEntity.setId(taskDetailId);
        detailEntity.setLockStatus(2);
        wareOrderTaskDetailService.updateById(detailEntity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            wrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            wrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1.判断如果还没有这个库存记录新增
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (wareSkuEntities.size() == 0 || wareSkuEntities == null) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //远程查询，如果失败事务无需回滚
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {

            }


            wareSkuDao.insert(skuEntity);
        }
        wareSkuDao.addStock(skuId, wareId, skuNum);
    }

    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(sku -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(sku);
            vo.setSkuId(sku);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;

    }

    //为某个订单锁定库存
    /**
    * 库存需要解锁的场景
     * 1.下订单成功后，订单没有支付，被系统自动取消
     * 2.下订单成功，库存锁定成功，其他业务调用失败，导致订单回滚
     *   之前锁定的库存就要自动解锁
    */
    @Transactional
    //只要是运行时异常都会回滚
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /*
        * 保存库存工作单的详情
        * 追溯。
        */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(taskEntity);
        //1。本应该按照下单的收货地址，找到一个就近仓库
        //1。找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());
        Boolean allLock =true;
        //2.锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                //没有任何仓库有库存
                throw new NoStockException(skuId);
            }
            for (Long wareId : wareIds) {
               Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
               if (count==1){
                   skuStocked =true;
                   //todo 发送消息，库存锁定成功
                   WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity(null, skuId, null, hasStock.getNum(), taskEntity.getId(), wareId, 1);
                   wareOrderTaskDetailService.save(taskDetailEntity);
                   StockLockedTo lockedTo = new StockLockedTo();
                   lockedTo.setId(taskEntity.getId());
                   StockDetailTo stockDetailTo = new StockDetailTo();
                   BeanUtils.copyProperties(taskDetailEntity,stockDetailTo);
                   lockedTo.setDetail(stockDetailTo);
                   rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                   break;
               }else {
                   //当前仓库锁失败，重试下一个
               }
            }
            if (skuStocked==false){
                throw new NoStockException(skuId);
            }
        }
        //3.全部锁定成功
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {

        StockDetailTo detail = to.getDetail();
        Long id = detail.getId();
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(id);
        if (byId!=null){
            //解锁
            Long taskId = to.getId();
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(taskId);
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode()==0){
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });

                if (data==null||data.getStatus()==4) {
                    //订单已经被取消,解锁库存
                    //订单不存在
                    if (byId.getLockStatus()==1){
                        //当前库存工作清单 状态为已锁定 才解锁
                        unlock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), id);
                    }
                }
            }else {
                //消息拒绝，重新放回队列
                throw new RuntimeException("远程服务失败");
            }
        }else {
            //无需解锁
        }
    }

    /**
     * 防止订单服务卡顿，导致订单状态消息一直无法修改，库存消息优先到期，导致卡顿订单永远不能解锁库存
     * @param orderTo
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        WareOrderTaskEntity task = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单招到所有没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> list = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : list) {
            unlock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}